Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2012 dataset :

        Prescription status code for |
                       medication #7 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        254        2.54        2.54
                Nonprescription drug |          9        0.09        2.63
                        Undetermined |          3        0.03        2.66
Prescription or Nonprescription drug |        123        1.23        3.89
                                   . |      9,611       96.11      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016